Inductance coil



Dec. 29 1925. 15672600 P. J. KELLY INDUCTANCE COIL Filed March 22, 1924 nlp-T- U59. Sg? awa/IMM abbina;

Patented Escu Z9, i925.

1,557,6til

UNITED STATES PATENT FFIC.

PATRICK J. KELLY, OF PHILADELPHIA, PENNSYLVANIA.

Application filed March 22, i924. Serial No. 701,194.

T0 all whom t may concern:

Be it known that I, PATRICK J. KELLY, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful improvements in lnductance Coils, of which the following is specification.

This invention relates to tuning inductances, and more particularly to a devicel for tuning and transforming a signal energy in a radio receiving circuit, for increasing' the efficiency of the circuit.

An object of the invention resides in providing an inductance having a plurality of coils arranged for cooperation and constructed in predetermined proportions adapted to be interposed in the antennae, plate, and grid and filament circuits of an audion bulb type of "eceiving set, the coils cooperating to transform and amplify the signals received in the antennes circuit for increasing the distant range of reception of the set, and increasing the amplification of the signals in the circuit.

Another object of the invention resides in providing an inductance coil comprising a stationary tube member provided with a secondary winding, arranged in spaced sections of equal inductive value on the tube, a

primary superposed on the secondary, and formed of space-d sections of predetermined inductance value, and equal in each section, having a predetermined relation with the sections of the secondary, and arranged in a special relation to the secondary section, the primary being connect-ed in the antennae section, and the secondary in the filament and gri-d circuits of a radio receiving set of the a-udion bulb type, while a movable coil member is rotatably mounted within the tube, on an aXis extending` between the sections of the secondary coi, and which last mentioned coil is also formed in spaced sections of equal inductive value, and adapted for connection in the plate and phone circuit of the receiving set, in order to produce a cooperation with the stationary primary and secondary coils, so that signals received in the primary circuit will be transformed and amplified in the secondary coil, and the movable coil, for obtaining a maximum range of reception in the set and amplification in the receiving circuit.

The invention also includes other objects and improvements in the details of const-ruction and assemblage of parts, which are more particularly pointed out in the following description and claims, directed to a prefered form of the invention, it being understood, however, that variations may be made in this construction, without departing from the principal and essential elements of the invention as described and claimed.

.ln the drawing, forming a part of this application:

Figure l is a side elevation of the inductance coil constructed according to the invention.

Figure 2 is a vertical transverse section therethrough.

Figure 3 is a wiring diagram, showing the manner of interposing the coils of an inductance in the radio receiving circuit.

A tubular member is indicated at l, which forms a mounting for the several parts of the invention, and on which is mounted the secondary inductance winding indicated at 2, which is arranged in separated sections 3 and l respectively, which contain a substantially equal number of strands of wire, in order that the inductive valu-e of each section 3 and l will be substantially equal. Sections 3 and 4 of the secondary winding, are mounted at substantially equa-l distances from the ends of the tubular member l, while the space between the coil sections is substantially equal or slightly less than the width of each section, this distance being predetermined, in accordance with the number of strands of wire, in each section, for obtaining the most efficient results, the connecting wire between the two sections having substantially a half turn, as indicated 5, which will not materially affect a functioning of the coil sections. rl`he ends of the secondary winding, indicated at 6 and 7 respectively, are extended through openings in the tubular member and longitudinally of th-e same to the bottom end of the member, where they are connected with suitable binding posts 8, arranged in spaced relation on the lower edge of said member 1.

A primary winding 9 is superposed in concentric relation, on the secondary winding 2, and is provided with sections lO and l1, having substantially an equal Vnumber of turns arranged in spaced relation to one another, onc section being superposed on each of the sections of the secondary winding, as

clearly shown in Figures 1 and Q, a halt turn 12 joining` the sections in the intermediate portion et the membeixy as s-ihown. The primary winding is formed ot" a larger Qauge wire than the secondary windinn, and has considerably Ytewer turns, sc that the space occupied by the winding is substantially halt of that occupied by the secondary winding, the sections 10 and 1l ot the primary winding being arranged with corresponding` ends adjacent corresponding e ds or the seconcary winding, as shown in Figure l, which has been found to proouce the most cl'hcient cooperation between the two windings. 'The ends of the primary windings are emended through openings in the tubular member l, as indicated at 1.1%, and directed longitudi nally alongV the interior ot the member, and are connected to binding' posts or other suitable terminals il, arranged in spaced relation at the lower end ot t e ar memberl 1. and opposite the terminals S ot the secondary coil, tor receiving the circuit connectinftg` wire tor properly i erj'iosing' ilu` primary windingr in the ant circuit.

Bracket members 15 are mounted at diametrically opposite sides oi the tubular meinber l between the sectii'ins ot the primary and secondary windings, which 'e formed oit a single piece oic sheet mute bracket member has an arci t A* on 1G adapted to lit the tubular member, and contorni to the curvature thereoi and which is secured to the tubular member by suitable means indicated at 1i', the central portion ot the base i6 having outwardly extending parallel projections 18, the lower one oi which is former,L with an opening 19, adapted to receive and provide a bearing` 'lio-r the spherical head 20, on the rotatable bearing members 21. As clearly illustrated in the drawings, the bearing; members 21 iit bctween the projectionsll, the resiliency ol" l which retains the spherical heads in the respcctive bearings through tie cooperation ot the openings 19 therewith, and which trictionally engage the heads with sunicient force to provide a perfect electrical conduit. Set screw 22 are mounted in opposite ends ot the projections 1S, and are adapted to adjust the tension of these bearing members on the spherical head. Each ot the bearing` members Q1 receive shaft extensions 23, carried by a movable member 2li, and which extend through openings 25., at diametrically opposite points in the tubular member l. The movable member 24 is of tubular 'to im, and smaller in diameter than the tubular member 1, and mounted in said member 1, so that in the position shown in Figure 2, the members are concentric, and the axis of rotation oi the movable member entends midway between the coil sections 8 and 4 ot the secondary coil on the tubular member 1. The airis et the movable member l extends nected` as indicated at 29, with suitable terminals carried by the ends ot each sha-tt section 2?), so that an elec :rical circuit is provided to the bearing members 15 through the shait and the spherical head 20. Suitable terminals are provided on each bearing` member, as indicated at 80, with which the proper circuit wire tor the removable coil may be connected. One ot the bearing inembers is provided, at the end ot the upper extension i8 with a vertically extending termi nal portion 3l, which receives screws 32, in threaded eng)D .gement therewith, tor mounting the bar assembly on the back olf an instrument board indicated at 33, ot a radio receiving set, while one ot' the shaft sections 25 has an extension 34;, which projects through an opening 35 in the panel 33 tor receiving a suitable form ot operating handle 36, so that the movable core may be rotated on its axis within the stationary tubular member l and the stationary coils carried thereby for ettecting a tuning action in the corresponding circuit when the niember is rotated, through the operation ot' the handle 36. l

rlhe wiring diagram in Figure 3 shows one form ot application oit the invention to a radio receiving set, and in which the prin'iary coil 9 is connected in the antennae wound circuit, by having` the antenna,v lead in wire, and the `ground wire connected to the respective binding` posts 11i, Alor this purpose. rl`he secondary coil 2 on the tubular member l, is connected in the grid and filament circuit or the setby suitable connections 37 and 88, a variable condenser having a vernier being indicated at 39, interposed in parallel with the stationary coil 2, and which is adapted tor tuning,- the circuit containing' the coil. One terminal of the movable coil 26 is connected by a wire 40, with one terminal ot the phones indicated at ell, while the other terminal of the movable coil is connected by a wire 42, with the plate oil the audion bulb 43. rlhe A and B batteries indicated at est and l5 respectively, are interposed in the circuit in the manner illustrated for tunctioning` in connection with the tube l?) in the well known manner.

From the above description, it will be seen that an induction coil has been provided for use in radio receiving sets, wherein the primary and stationary secondary are in such an intimate concentric relation, that substantially wealr currents in the primary will be effectively transformed in the secondary, and through the impressed voltage therein produce a substantially amplified current in the secondary for building up the field to the coil, which will be further received and transformed in the movable coil 26, so that a maximum amplifica-tion in the phone circuit will resultto enable signals of a considerably weak nature in the primary to be effectively received, so that the normal receiving range of the andion bulb will be effectively increased, together with the increased amplification of the sounds produced in the phones 4l.

`What is claimed is:

l. An inductance coil for radio receiving apparatus comprising a secondary stationary inductance, formed in a pair of separated sections mounted in axial alignment, a primary winding formed in a pair of sections superposed on the sections of the secondary winding in concentric relation, and a movable inductance coil of smaller size than the first mentioned coil rotatable on an axis extending between the sections of the first mentioned coil.

2. An inductance coil for radio receiving apparatus including a tubular member, a secondary coil mounted on said tubular member and arranged in spaced sections thereon, a primary coil formed of sections superposed on the sections of the secondary winding, binding posts mounted in spaced relation on the tubular member and having the ends of the respective coils connected thereto, bearing members mounted at diametrically opposite points on the tubular memb r, a movable member having shaft extensions rotatably mounted in bearing members, said bearing members and shaft extensions extending between the sections of the primary and secondary coils on said tubular member to position the axis of rotation of the movable member centrally between the sections of said coils, and a movable coil mounted on the movable member,

and having electrical connections with the shaft extensions and the bearing members which provide terminals for the movable coil.

3. An inductance coil comprising a pair of independent superposed concentric stationary coils, said coils being formed in separate sections in axial alignment, said sections being formed of a continuous winding, the inner coil having a substantally greater inductive value than the outer coil, and the sections of the outer coil being disposed over one end portion of the sections of the inner coil.

d. A lthree circuit inductance coil comprising a pair of stator coils, one of said stator coils being formed of a pair of separated sections of continuously wound wire, the sec-tions being `joined by substantially a half turn of said wire, the other stator coil being formed in a pair of sections directly wound on the first mentioned stator section, the last mentioned stator coil being formed of a continuous winding having the sections joined by a half turn of the winding substantially overlying the half turn of the first mentioned stator winding, and a rotor coil movable on an axis extending between the stator coil sections.

5. A three circuit inductance coil comprising a cylindrical coil support, an inner stator coil directly wound on said support, an outer stator coil directly wound on the inner stator coil, said coils having the end portions extended through said support to the interior thereof, said end portions being positioned against the inner face of the coil supports and extending outwardly toward the end portion thereof, the terminals of the ends of the said coils being extended outwardly through the end portions of said coil support beyond the ends of the inductance coils on said support for connection with terminals carried by said support.

In testimony whereof I aiiix my signature.

PATRICK J. KELLY. 

